<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		*{
			padding: 0px;
			margin:0px; 
		}
		li{
			list-style: none;
			width: 150px;
			height: 50px;
			background: #272728 url() 0 0 no-repeat;
			color: #fff;
			line-height: 50px;
			text-align: center;
			cursor: pointer;
		}
		li:hover{
			background: #191622 url() 0 0 no-repeat;
		}
		.father{
			
			float: left;
		}
		.son{
			background: red url() 0 0 no-repeat;
			display: none;
		}
	</style>
	<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
	<script type="text/javascript">
		$(function(){

			$('.father').hover(function(){
				$(this).children('.son').show();
			},function(){
				$(this).children('.son').hide();
			})
		})
	</script>
</head>
<body>
	<ul class="box">
		<li class="father">栏目1
			<ul class="son">
				<li>栏目1-1</li>
				<li>栏目1-2</li>
				<li>栏目1-3</li>
				<li>栏目1-4</li>
				<li>栏目1-5</li>
				<li>栏目1-6</li>
			</ul>
		</li>
		<li class="father">栏目2
			<ul class="son">
				<li>栏目2-1</li>
				<li>栏目2-2</li>
				<li>栏目2-3</li>
				<li>栏目2-4</li>
			</ul>
		</li>
		<li class="father">栏目3
			<ul class="son">
				<li>栏目3-1</li>
				<li>栏目3-2</li>
				<li>栏目3-3</li>
				<li>栏目3-4</li>
				<li>栏目3-5</li>
				<li>栏目3-6</li>
				<li>栏目3-7</li>
			</ul>
		</li>
		<li class="father">栏目4
			<ul class="son">
				<li>栏目4-1</li>
				<li>栏目4-2</li>
				<li>栏目4-3</li>
			</ul>
		</li>
	</ul>
</body>
</html>